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US4877464A
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Rapid magnetic annealing of amorphous metal in molten tin
Assignee: Honeywell International Inc
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Filing: 1987-04-02
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Granted: 1989-10-31
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Expires: 2007-04-02
Abstract
Abstract A method of rapidly annealing an amorphous alloy consisting of applying a magnetic field to the alloy, immersing the alloy in a liquid comprising molten tin and then placing the amorphous alloy in a cooling fluid. The cooling fluid may be an organic liquid or liquefied gas. Rapid magnetic annealing provides advantages not only of less time and energy costs, but also yields an annealed alloy that is more ductile than those of the prior art. The greater ductility permits the amorphous alloy to be annealed by this method and then rewound into a core.
Inventors
- 👤 John Silgailis
- 👤 Davidson Nathasingh
- 👤 Christopher A. Bruckner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:48
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C21D1/04; C21D1/34; C21D1/44; C21D1/48; C21D9/00; C21D9/52; C21D9/54
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
A method for rapid magnetic annealing of an amorphous metal alloy alloy comprising the steps of (a) applying a magnetic field to the alloy, (b) immersing the alloy in a liquid comprising molten tin, whose temperature is in the range between about 0.6 T g and 1.0 T g , where T g is the glass transition temperature of the alloy in degrees C., (c) separating the alloy from the liquid, and (d) immersing the alloy in a cooling fluid.
Claim 2
Independent Claim
80 words
A method for rapid magnetic annealing of an amorphous metal alloy alloy comprising the steps of (a) applying a magnetic field to the alloy, (b) immersing the alloy in a liquid comprising molten tin, whose temperature is in the range between about 0.6 T g and 1.0 T g , where T g is the glass transition temperature of the alloy in degrees C., (c) separating the alloy from the liquid, and (d) immersing the alloy in a cooling fluid.
Claim 3
Dependent Claim
26 words
The method of claim 1 in which the temperature of the liquid is in the range between about 0.7 T g and 0.8 T g .
Claim 4
Dependent Claim
13 words
The method of claim 1 in which the alloy comprises an iron-based alloy.
Claim 5
Dependent Claim
13 words
The method of claim 3 in which the alloy comprises an Fe-B-Si alloy.
Claim 6
Dependent Claim
33 words
The method of claim 1 in which the alloy temperature is maintained in the range between about 0.7 T g and 0.8 T g for a period of less than about 30 minutes.
Claim 7
Dependent Claim
30 words
The method of claim 5 in which the alloy temperature is maintained in the range between about 0.7 T g and 0.8 T g for less than about 15 minutes.
Claim 8
Dependent Claim
14 words
The method of claim 1 in which the cooling fluid comprises an organic liquid.
Claim 9
Dependent Claim
13 words
The method of claim 7 in which the cooling fluid comprises a fluorocarbon.
Claim 10
Dependent Claim
31 words
The method of claim 7 in which the cooling fluid comprises a mixture of dry ice and at least one liquid selected from the group consisting of acetone, methanol, and ethanol.
Claim 11
Dependent Claim
13 words
The method of claim 1 in which the cooling fluid comprises liquid nitrogen.
Claim 12
Dependent Claim
25 words
The method of claim 1 in which the alloy is immersed in the cooling fluid until the alloy temperature is about 200° C. or less.
Claim 13
Dependent Claim
43 words
The method of claim 1 further comprising the step of coating the alloy, before immersing it in the liquid, with a material that will reduce any tendency for the liquid to adhere to the core after the alloy has been separated from it.
Claim 14
Dependent Claim
14 words
The method of claim 12 in which the coating material comprises a dewetting material.
Claim 15
Dependent Claim
47 words
The method of claim 1 in which there is a direction in the alloy for which the rate of heat transfer is a minimum and any external surface that is normal to that direction is provided with thermal insulation before the alloy is immersed in the liquid.
Claim 16
Dependent Claim
22 words
The method of claim 1 in which the alloy is placed in a protective wrap before it is immersed in the liquid.
Claim 17
Dependent Claim
24 words
The method of claim 15 in which the wrap comprises a material selected from the group consisting of metal foil, fiberglass, and polyimide film.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |